APA (7th ed.) Citation

Armitage, E. S. M. The Early Norman Castles of the British Isles.

Chicago Style (17th ed.) Citation

Armitage, Ella S.; Montgomerie. The Early Norman Castles of the British Isles.

MLA (9th ed.) Citation

Armitage, Ella S.; Montgomerie. The Early Norman Castles of the British Isles.

Warning: These citations may not always be 100% accurate.